Click on each image to get a larger view of the edges.
This is the original color image.
These are edges detected in each color channel.
This is a composite (best of three) of the color detected edges.
This is a grey scale image of the bear.
These are the edges detected in the grey scale image.
There were marginal gains in performing color edge detection. Color edge detection tends to perform better in color graphic images rather than color photographs due to the tendency to have more pronounced color edges. In general, despite having three times the information, color edge detection does not work three times as well as the the grey scale edge detection